package com.activiti.controller;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.activiti.rest.editor.model.ModelSaveRestResource;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

@RestController
public class ModelSave extends ModelSaveRestResource{
	  final String MODEL_ID = "modelId";
	  final String MODEL_NAME = "name";
	  final String MODEL_REVISION = "revision";
	  final String MODEL_DESCRIPTION = "description";
	// protected static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

	  @Autowired
	  private RepositoryService repositoryService;
	  
	  @Autowired
	  private ObjectMapper objectMapper;
	  
	  @RequestMapping(value="/model/{modelId}/save", method = RequestMethod.PUT)
	  @ResponseStatus(value = HttpStatus.OK)
	  public void saveModel(@PathVariable String modelId, @RequestBody MultiValueMap<String, String> values) {
	    try {
	      
	      Model model = repositoryService.getModel(modelId);
	      
	      ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
	      
	      modelJson.put(MODEL_NAME, values.getFirst("name"));
	      modelJson.put(MODEL_DESCRIPTION, values.getFirst("description"));
	      model.setMetaInfo(modelJson.toString());
	      model.setName(values.getFirst("name"));
	      
	      repositoryService.saveModel(model);
	      
	      repositoryService.addModelEditorSource(model.getId(), values.getFirst("json_xml").getBytes("utf-8"));
	      
	      InputStream svgStream = new ByteArrayInputStream(values.getFirst("svg_xml").getBytes("utf-8"));
	      TranscoderInput input = new TranscoderInput(svgStream);
	      
	      PNGTranscoder transcoder = new PNGTranscoder();
	      // Setup output
	      ByteArrayOutputStream outStream = new ByteArrayOutputStream();
	      TranscoderOutput output = new TranscoderOutput(outStream);
	      
	      // Do the transformation
	      transcoder.transcode(input, output);
	      final byte[] result = outStream.toByteArray();
	      repositoryService.addModelEditorSourceExtra(model.getId(), result);
	      outStream.close();
	      
	    } catch (Exception e) {
	      LOGGER.error("Error saving model", e);
	      throw new ActivitiException("Error saving model", e);
	    }
	  }
}
